Description: To realize the shift encryption and decryption process. Shift the password, that is, move backward k-bit, k is the key, is arbitrary. An English phrase or word used as a key, remove the duplicate letters which have no repeated letters of a string, and then the other letters in the alphabet so after writing this letter string. Expressly identify the alphabet letters in the original location, then add the key position on the alphabet letter that corresponds to ciphertext.
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JAVA.txt
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